One of the most interesting problems in zoology has always been the life of social insects. Many generations of researchers have endeavored to clarify the laws of coexistence among thousands of animals within such a strictly organized social structure, yet not all questions have been answered to this day. The wasps and hornets, which are well-known primarily for their venomous stingers, are examined here by an excellent expert on these species. Through his tireless efforts, detailed observations, and experiments, Professor Schremmer has been able to uncover many secrets. He presents us with a vivid picture of the biology of these insects, from nest building, the complicated developmental rhythm, the rearing of the young, to the numerous enemies and parasites against which these insect species continually devise defense measures.